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        </div><article class="page single"><h1 class="single-title animate__animated animate__flipInX">ArrayList源码分析（下）——Java8中新增的Spliterator的分析</h1><div class="post-meta">
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  <ul>
    <li><a href="#arraylist源码分析下从arraylist中分析java8新增的方法">ArrayList源码分析（下）——从ArrayList中分析Java8新增的方法</a>
      <ul>
        <li><a href="#1-spliterator">1. spliterator</a></li>
      </ul>
    </li>
  </ul>
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            </div><div class="content" id="content"><h2 id="arraylist源码分析下从arraylist中分析java8新增的方法">ArrayList源码分析（下）——从ArrayList中分析Java8新增的方法</h2>
<p>从集合的最基本的接口Collection中可以看出Java8中新增了下面几点内容：</p>
<ol>
<li>spliterator</li>
<li>stream</li>
<li>parallelStream</li>
</ol>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="k">default</span> <span class="n">Spliterator</span><span class="o">&lt;</span><span class="n">E</span><span class="o">&gt;</span> <span class="nf">spliterator</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="k">return</span> <span class="n">Spliterators</span><span class="o">.</span><span class="na">spliterator</span><span class="o">(</span><span class="k">this</span><span class="o">,</span> <span class="mi">0</span><span class="o">);</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
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<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">default Stream&lt;E&gt; stream() {
</span></span><span class="line"><span class="cl">	return StreamSupport.stream(spliterator(), false);
</span></span><span class="line"><span class="cl">}
</span></span></code></pre></td></tr></table>
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<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">default Stream&lt;E&gt; parallelStream() {
</span></span><span class="line"><span class="cl">	return StreamSupport.stream(spliterator(), true);
</span></span><span class="line"><span class="cl">}
</span></span></code></pre></td></tr></table>
</div>
</div><h3 id="1-spliterator">1. spliterator</h3>
<p>从源码中可以看出spiterator返回一个Spliterator对象。
Spliterator用于遍历和分隔一个对象中的元素，这个对象必须实现Spliterator接口，实现这个接口类有Collection，数组等。
Spliterator可以逐个的遍历元素，或者批量的遍历。
Spliterator是一个可以分割的迭代器，可以将Spilterator实例分割成多个小的Spilterator实例。
下面的是Spliterator中的一些特征值：</p>
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<pre tabindex="0" class="chroma"><code class="language-fallback" data-lang="fallback"><span class="line"><span class="cl">// 表示迭代器需要按照原始的顺序迭代器中的元素
</span></span><span class="line"><span class="cl">    public static final int ORDERED    = 0x00000010;
</span></span><span class="line"><span class="cl">	// 迭代器中的元素是没音重复的
</span></span><span class="line"><span class="cl">    public static final int DISTINCT   = 0x00000001;
</span></span><span class="line"><span class="cl">	// 按照某种排序方式的顺序迭代其中的元素
</span></span><span class="line"><span class="cl">    public static final int SORTED     = 0x00000004;
</span></span><span class="line"><span class="cl">	// 表示迭代器中的元素的个数是可计数的，有界的
</span></span><span class="line"><span class="cl">    public static final int SIZED      = 0x00000040;
</span></span><span class="line"><span class="cl">	// 迭代器中的元素是非空的
</span></span><span class="line"><span class="cl">    public static final int NONNULL    = 0x00000100;
</span></span><span class="line"><span class="cl">	// 迭代器中的元素是不可以改变的，不能增加也不能替换和删除。
</span></span><span class="line"><span class="cl">    public static final int IMMUTABLE  = 0x00000400;
</span></span><span class="line"><span class="cl">	// 表示迭代器的数据源是线程安全的`
</span></span><span class="line"><span class="cl">	public static final int CONCURRENT = 0x00001000;
</span></span><span class="line"><span class="cl">	// 表示当前的迭代器的所有的子迭代器（直接的或者间接的），都是&#39;SIZED&#39;和SUBSIZED的
</span></span><span class="line"><span class="cl">    public static final int SUBSIZED = 0x00004000;
</span></span><span class="line"><span class="cl">}
</span></span></code></pre></td></tr></table>
</div>
</div><p>下面的是Spliterator中的一些方法：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">interface</span> <span class="nc">Spliterator</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">	<span class="c1">// 如果有元素剩余，那么执行action，并返回true，如果没有元素剩余，返回false
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>    <span class="kt">boolean</span> <span class="nf">tryAdvance</span><span class="o">(</span><span class="n">Consumer</span><span class="o">&lt;?</span> <span class="kd">super</span> <span class="n">T</span><span class="o">&gt;</span> <span class="n">action</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">	<span class="c1">// 对当前的线程中的元素执行给定的操作，直到所有的元素被处理或者抛出异常
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>	<span class="k">default</span> <span class="kt">void</span> <span class="nf">forEachRemaining</span><span class="o">(</span><span class="n">Consumer</span><span class="o">&lt;?</span> <span class="kd">super</span> <span class="n">T</span><span class="o">&gt;</span> <span class="n">action</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 从这里也可以看出tryAdvance的用法
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="k">do</span> <span class="o">{</span> <span class="o">}</span> <span class="k">while</span> <span class="o">(</span><span class="n">tryAdvance</span><span class="o">(</span><span class="n">action</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">    <span class="o">}</span>
</span></span><span class="line"><span class="cl">	<span class="c1">// 将一个Spliterator。分割的Spliterator可以被用于每个子线程进行处理，从而达到并发的效果
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>    <span class="n">Spliterator</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span> <span class="nf">trySplit</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">	<span class="c1">// 返回forEachRemain()需要遍历元素总数的估计值，如果这个结果是无穷大，未计数的，那么返回
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>    <span class="kt">long</span> <span class="nf">estimateSize</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">    <span class="c1">// 如果当前线程是可以计算剩余元素的总数，那么返回剩余元素的总数，否则返回-1
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>	<span class="k">default</span> <span class="kt">long</span> <span class="nf">getExactSizeIfKnown</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">		<span class="c1">// 这里利用了与、或运算，可以先看下面的
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="k">return</span> <span class="o">(</span><span class="n">characteristics</span><span class="o">()</span> <span class="o">&amp;</span> <span class="n">SIZED</span><span class="o">)</span> <span class="o">==</span> <span class="mi">0</span> <span class="o">?</span> <span class="o">-</span><span class="mi">1L</span> <span class="o">:</span> <span class="n">estimateSize</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">    <span class="o">}</span>
</span></span><span class="line"><span class="cl">	<span class="c1">// 返回此Spliterator及其元素的一组特征值，这些结果表示为（ORDERED ， DISTINCT ， SORTED ， SIZED ，  NONNULL ， IMMUTABLE ， CONCURRENT ， SUBSIZED ）的或运算
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>	<span class="c1">// 如果符合该Spliterator有什么特性，那么代表那个属性的那一位就是1，否则就是0
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>    <span class="kt">int</span> <span class="nf">characteristics</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">	
</span></span><span class="line"><span class="cl">	<span class="c1">// Spliterator是否有执行的特性，
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>	<span class="c1">// 这里同样使用了位运算的特性
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>    <span class="k">default</span> <span class="kt">boolean</span> <span class="nf">hasCharacteristics</span><span class="o">(</span><span class="kt">int</span> <span class="n">characteristics</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">        <span class="k">return</span> <span class="o">(</span><span class="n">characteristics</span><span class="o">()</span> <span class="o">&amp;</span> <span class="n">characteristics</span><span class="o">)</span> <span class="o">==</span> <span class="n">characteristics</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">    <span class="o">}</span>
</span></span><span class="line"><span class="cl">	
</span></span><span class="line"><span class="cl">	<span class="c1">// 如果这个Spilterator的数据源是可排序的，如果数据源是自然排序，返回null。 如果数据源不是SORTED，则抛出IllegalStateException
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>    <span class="k">default</span> <span class="n">Comparator</span><span class="o">&lt;?</span> <span class="kd">super</span> <span class="n">T</span><span class="o">&gt;</span> <span class="nf">getComparator</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">        <span class="k">throw</span> <span class="k">new</span> <span class="n">IllegalStateException</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">    <span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>下面的这个是Spliterator的一个内部接口，这个接口继承了Spliterator这个接口。</p>
<div class="highlight"><div class="chroma">
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm"> * @param &lt;T&gt; 此Spliterator的返回类型，该类型必须是原始类型的包装类型，如Integer的原始类型int类型
</span></span></span><span class="line"><span class="cl"><span class="cm"> * @param &lt;T_CONS&gt; 原始消费者类型Consumer，必须和T对应，例如Integer对应IntConsumer
</span></span></span><span class="line"><span class="cl"><span class="cm"> * @param &lt;T_SPLITR&gt; 原始的Spilterator。该类型和上面的一样，必须和T对应
</span></span></span><span class="line"><span class="cl"><span class="cm"> *  这么说可能还是不好理解，可以看下面的一个实现
</span></span></span><span class="line"><span class="cl"><span class="cm"> */</span>
</span></span><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">interface</span> <span class="nc">OfPrimitive</span><span class="o">&lt;</span><span class="n">T</span><span class="o">,</span> <span class="n">T_CONS</span><span class="o">,</span> <span class="n">T_SPLITR</span> <span class="kd">extends</span> <span class="n">java</span><span class="o">.</span><span class="na">util</span><span class="o">.</span><span class="na">Spliterator</span><span class="o">.</span><span class="na">OfPrimit</span>
</span></span><span class="line"><span class="cl">        <span class="kd">extends</span> <span class="n">java</span><span class="o">.</span><span class="na">util</span><span class="o">.</span><span class="na">Spliterator</span><span class="o">&lt;</span><span class="n">T</span><span class="o">&gt;</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">    <span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">    <span class="n">T_SPLITR</span> <span class="nf">trySplit</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">	
</span></span><span class="line"><span class="cl">    <span class="nd">@SuppressWarnings</span><span class="o">(</span><span class="s">&#34;overloads&#34;</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">    <span class="kt">boolean</span> <span class="nf">tryAdvance</span><span class="o">(</span><span class="n">T_CONS</span> <span class="n">action</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">    
</span></span><span class="line"><span class="cl">    <span class="nd">@SuppressWarnings</span><span class="o">(</span><span class="s">&#34;overloads&#34;</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">    <span class="k">default</span> <span class="kt">void</span> <span class="nf">forEachRemaining</span><span class="o">(</span><span class="n">T_CONS</span> <span class="n">action</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">        <span class="k">do</span> <span class="o">{</span> <span class="o">}</span> <span class="k">while</span> <span class="o">(</span><span class="n">tryAdvance</span><span class="o">(</span><span class="n">action</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">    <span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><div class="highlight"><div class="chroma">
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="kd">public</span> <span class="kd">interface</span> <span class="nc">OfInt</span> <span class="kd">extends</span> <span class="n">java</span><span class="o">.</span><span class="na">util</span><span class="o">.</span><span class="na">Spliterator</span><span class="o">.</span><span class="na">OfPrimitive</span><span class="o">&lt;</span><span class="n">Integer</span><span class="o">,</span> <span class="n">IntConsumer</span><span class="o">,</span> <span class="n">java</span><span class="o">.</span><span class="na">util</span><span class="o">.</span><span class="na">Spliterato</span>
</span></span><span class="line"><span class="cl">    <span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">    <span class="n">OfInt</span> <span class="nf">trySplit</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">    <span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">    <span class="kt">boolean</span> <span class="nf">tryAdvance</span><span class="o">(</span><span class="n">IntConsumer</span> <span class="n">action</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">    <span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">    <span class="k">default</span> <span class="kt">void</span> <span class="nf">forEachRemaining</span><span class="o">(</span><span class="n">IntConsumer</span> <span class="n">action</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">        <span class="k">do</span> <span class="o">{</span> <span class="o">}</span> <span class="k">while</span> <span class="o">(</span><span class="n">tryAdvance</span><span class="o">(</span><span class="n">action</span><span class="o">));</span>
</span></span><span class="line"><span class="cl">    <span class="o">}</span>
</span></span><span class="line"><span class="cl">    
</span></span><span class="line"><span class="cl">    <span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">    <span class="k">default</span> <span class="kt">boolean</span> <span class="nf">tryAdvance</span><span class="o">(</span><span class="n">Consumer</span><span class="o">&lt;?</span> <span class="kd">super</span> <span class="n">Integer</span><span class="o">&gt;</span> <span class="n">action</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">        <span class="k">if</span> <span class="o">(</span><span class="n">action</span> <span class="k">instanceof</span> <span class="n">IntConsumer</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">            <span class="k">return</span> <span class="n">tryAdvance</span><span class="o">((</span><span class="n">IntConsumer</span><span class="o">)</span> <span class="n">action</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">        <span class="o">}</span>
</span></span><span class="line"><span class="cl">        <span class="k">else</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">            <span class="k">if</span> <span class="o">(</span><span class="n">Tripwire</span><span class="o">.</span><span class="na">ENABLED</span><span class="o">)</span>   <span class="c1">// 如果Boolea系统的属性org.openjdk.java.util.stream.tripwire设置为true
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>                <span class="n">Tripwire</span><span class="o">.</span><span class="na">trip</span><span class="o">(</span><span class="n">getClass</span><span class="o">(),</span>   <span class="c1">// 那么这里会出现警告
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>                        <span class="s">&#34;{0} calling Spliterator.OfInt.tryAdvance((IntConsumer) action::accept)&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">            <span class="k">return</span> <span class="n">tryAdvance</span><span class="o">((</span><span class="n">IntConsumer</span><span class="o">)</span> <span class="n">action</span><span class="o">::</span><span class="n">accept</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">        <span class="o">}</span>
</span></span><span class="line"><span class="cl">    <span class="o">}</span>
</span></span><span class="line"><span class="cl">  
</span></span><span class="line"><span class="cl">    <span class="nd">@Override</span>
</span></span><span class="line"><span class="cl">    <span class="k">default</span> <span class="kt">void</span> <span class="nf">forEachRemaining</span><span class="o">(</span><span class="n">Consumer</span><span class="o">&lt;?</span> <span class="kd">super</span> <span class="n">Integer</span><span class="o">&gt;</span> <span class="n">action</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">        <span class="k">if</span> <span class="o">(</span><span class="n">action</span> <span class="k">instanceof</span> <span class="n">IntConsumer</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">            <span class="n">forEachRemaining</span><span class="o">((</span><span class="n">IntConsumer</span><span class="o">)</span> <span class="n">action</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">        <span class="o">}</span>
</span></span><span class="line"><span class="cl">        <span class="k">else</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">            <span class="k">if</span> <span class="o">(</span><span class="n">Tripwire</span><span class="o">.</span><span class="na">ENABLED</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">                <span class="n">Tripwire</span><span class="o">.</span><span class="na">trip</span><span class="o">(</span><span class="n">getClass</span><span class="o">(),</span>
</span></span><span class="line"><span class="cl">                        <span class="s">&#34;{0} calling Spliterator.OfInt.forEachRemaining((IntConsumer) action::accept)&#34;</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">            <span class="n">forEachRemaining</span><span class="o">((</span><span class="n">IntConsumer</span><span class="o">)</span> <span class="n">action</span><span class="o">::</span><span class="n">accept</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">        <span class="o">}</span>
</span></span><span class="line"><span class="cl">    <span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>下面的这个是ArrayList中获取分割器的一个实现：</p>
<div class="highlight"><div class="chroma">
<table class="lntable"><tr><td class="lntd">
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="nd">@Override</span>
</span></span><span class="line"><span class="cl"><span class="kd">public</span> <span class="n">Spliterator</span><span class="o">&lt;</span><span class="n">E</span><span class="o">&gt;</span> <span class="nf">spliterator</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">    <span class="k">return</span> <span class="k">new</span> <span class="n">ArrayListSpliterator</span><span class="o">&lt;&gt;(</span><span class="k">this</span><span class="o">,</span> <span class="mi">0</span><span class="o">,</span> <span class="o">-</span><span class="mi">1</span><span class="o">,</span> <span class="mi">0</span><span class="o">);</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
</div>
</div><p>下面的就是ArrayList中的ArrayListSpliterator的实现：</p>
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<pre tabindex="0" class="chroma"><code class="language-java" data-lang="java"><span class="line"><span class="cl"><span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm"> * 基于索引的、二分的、懒加载器
</span></span></span><span class="line"><span class="cl"><span class="cm"> * Index-based split-by-two, lazily initialized Spliterator
</span></span></span><span class="line"><span class="cl"><span class="cm"> */</span>
</span></span><span class="line"><span class="cl"><span class="kd">static</span> <span class="kd">final</span> <span class="kd">class</span> <span class="nc">ArrayListSpliterator</span><span class="o">&lt;</span><span class="n">E</span><span class="o">&gt;</span> <span class="kd">implements</span> <span class="n">Spliterator</span><span class="o">&lt;</span><span class="n">E</span><span class="o">&gt;</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">  
</span></span><span class="line"><span class="cl">    <span class="c1">// 用于存放ArrayList对象
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>    <span class="kd">private</span> <span class="kd">final</span> <span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">E</span><span class="o">&gt;</span> <span class="n">list</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">    <span class="c1">// 当前位置（包含），advance/spilt操作时会被修改
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>    <span class="kd">private</span> <span class="kt">int</span> <span class="n">index</span><span class="o">;</span> <span class="c1">// current index, modified on advance/split
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>    <span class="c1">// 结束位置（不包含），-1表示到最后一个元素
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>    <span class="kd">private</span> <span class="kt">int</span> <span class="n">fence</span><span class="o">;</span> <span class="c1">// -1 until used; then one past last index
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>    <span class="c1">// 用于存放list的modCount
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>    <span class="kd">private</span> <span class="kt">int</span> <span class="n">expectedModCount</span><span class="o">;</span> <span class="c1">// initialized when fence set
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>    <span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">     * Create new spliterator covering the given  range
</span></span></span><span class="line"><span class="cl"><span class="cm">     */</span>
</span></span><span class="line"><span class="cl">    <span class="n">ArrayListSpliterator</span><span class="o">(</span><span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">E</span><span class="o">&gt;</span> <span class="n">list</span><span class="o">,</span> <span class="kt">int</span> <span class="n">origin</span><span class="o">,</span> <span class="kt">int</span> <span class="n">fence</span><span class="o">,</span>
</span></span><span class="line"><span class="cl">                         <span class="kt">int</span> <span class="n">expectedModCount</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">        <span class="k">this</span><span class="o">.</span><span class="na">list</span> <span class="o">=</span> <span class="n">list</span><span class="o">;</span> <span class="c1">// OK if null unless traversed
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="k">this</span><span class="o">.</span><span class="na">index</span> <span class="o">=</span> <span class="n">origin</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">        <span class="k">this</span><span class="o">.</span><span class="na">fence</span> <span class="o">=</span> <span class="n">fence</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">        <span class="k">this</span><span class="o">.</span><span class="na">expectedModCount</span> <span class="o">=</span> <span class="n">expectedModCount</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">    <span class="o">}</span>
</span></span><span class="line"><span class="cl">    <span class="c1">// 第一次使用时实例化结束位置
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>    <span class="kd">private</span> <span class="kt">int</span> <span class="nf">getFence</span><span class="o">()</span> <span class="o">{</span> <span class="c1">// initialize fence to size on first use
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="kt">int</span> <span class="n">hi</span><span class="o">;</span> <span class="c1">// (a specialized variant appears in method forEach)
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">E</span><span class="o">&gt;</span> <span class="n">lst</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">        <span class="c1">// 第一次初始化时，fence才会小于0
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="k">if</span> <span class="o">((</span><span class="n">hi</span> <span class="o">=</span> <span class="n">fence</span><span class="o">)</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">            <span class="c1">// 如果集合中没有元素
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>            <span class="k">if</span> <span class="o">((</span><span class="n">lst</span> <span class="o">=</span> <span class="n">list</span><span class="o">)</span> <span class="o">==</span> <span class="kc">null</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">                <span class="n">hi</span> <span class="o">=</span> <span class="n">fence</span> <span class="o">=</span> <span class="mi">0</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">            <span class="k">else</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">                <span class="n">expectedModCount</span> <span class="o">=</span> <span class="n">lst</span><span class="o">.</span><span class="na">modCount</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">                <span class="n">hi</span> <span class="o">=</span> <span class="n">fence</span> <span class="o">=</span> <span class="n">lst</span><span class="o">.</span><span class="na">size</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">            <span class="o">}</span>
</span></span><span class="line"><span class="cl">        <span class="o">}</span>
</span></span><span class="line"><span class="cl">        <span class="k">return</span> <span class="n">hi</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">    <span class="o">}</span>
</span></span><span class="line"><span class="cl">    <span class="c1">// 分割list,返回一个返回一个新分割出的spilterator实例
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>    <span class="c1">// 相当于二分法，这个方法会递归
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>    <span class="c1">// 1. ArrayListSpilterator本质还是对原list进行操作，只是通过index和fence来控制每次处理的范围
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>    <span class="kd">public</span> <span class="n">ArrayListSpliterator</span><span class="o">&lt;</span><span class="n">E</span><span class="o">&gt;</span> <span class="nf">trySplit</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">        <span class="c1">// hi结束位置（不包括） lo:开始位置 mid中间位置
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="kt">int</span> <span class="n">hi</span> <span class="o">=</span> <span class="n">getFence</span><span class="o">(),</span> <span class="n">lo</span> <span class="o">=</span> <span class="n">index</span><span class="o">,</span> <span class="n">mid</span> <span class="o">=</span> <span class="o">(</span><span class="n">lo</span> <span class="o">+</span> <span class="n">hi</span><span class="o">)</span> <span class="o">&gt;&gt;&gt;</span> <span class="mi">1</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">        <span class="c1">// 当lo &gt;= mid， 表示不能再分割
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="c1">// 当lo &lt; mid时，表示可以分割，切割(lo, mid)出去，同时更新index = mid
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="k">return</span> <span class="o">(</span><span class="n">lo</span> <span class="o">&gt;=</span> <span class="n">mid</span><span class="o">)</span> <span class="o">?</span> <span class="kc">null</span> <span class="o">:</span> <span class="c1">// divide range in half unless too small
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>                <span class="k">new</span> <span class="n">ArrayListSpliterator</span><span class="o">&lt;</span><span class="n">E</span><span class="o">&gt;(</span><span class="n">list</span><span class="o">,</span> <span class="n">lo</span><span class="o">,</span> <span class="n">index</span> <span class="o">=</span> <span class="n">mid</span><span class="o">,</span>
</span></span><span class="line"><span class="cl">                        <span class="n">expectedModCount</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">    <span class="o">}</span>
</span></span><span class="line"><span class="cl">    <span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">     * 返回true时，表示可能还有元素未处理
</span></span></span><span class="line"><span class="cl"><span class="cm">     * 返回falsa时，没有剩余元素处理了
</span></span></span><span class="line"><span class="cl"><span class="cm">     *
</span></span></span><span class="line"><span class="cl"><span class="cm">     * @param action
</span></span></span><span class="line"><span class="cl"><span class="cm">     * @return
</span></span></span><span class="line"><span class="cl"><span class="cm">     */</span>
</span></span><span class="line"><span class="cl">    <span class="kd">public</span> <span class="kt">boolean</span> <span class="nf">tryAdvance</span><span class="o">(</span><span class="n">Consumer</span><span class="o">&lt;?</span> <span class="kd">super</span> <span class="n">E</span><span class="o">&gt;</span> <span class="n">action</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">        <span class="k">if</span> <span class="o">(</span><span class="n">action</span> <span class="o">==</span> <span class="kc">null</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">            <span class="k">throw</span> <span class="k">new</span> <span class="n">NullPointerException</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">        <span class="kt">int</span> <span class="n">hi</span> <span class="o">=</span> <span class="n">getFence</span><span class="o">(),</span> <span class="n">i</span> <span class="o">=</span> <span class="n">index</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">        <span class="k">if</span> <span class="o">(</span><span class="n">i</span> <span class="o">&lt;</span> <span class="n">hi</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">            <span class="n">index</span> <span class="o">=</span> <span class="n">i</span> <span class="o">+</span> <span class="mi">1</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">            <span class="nd">@SuppressWarnings</span><span class="o">(</span><span class="s">&#34;unchecked&#34;</span><span class="o">)</span> <span class="n">E</span> <span class="n">e</span> <span class="o">=</span> <span class="o">(</span><span class="n">E</span><span class="o">)</span> <span class="n">list</span><span class="o">.</span><span class="na">elementData</span><span class="o">[</span><span class="n">i</span><span class="o">];</span>
</span></span><span class="line"><span class="cl">            <span class="n">action</span><span class="o">.</span><span class="na">accept</span><span class="o">(</span><span class="n">e</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">            <span class="k">if</span> <span class="o">(</span><span class="n">list</span><span class="o">.</span><span class="na">modCount</span> <span class="o">!=</span> <span class="n">expectedModCount</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">                <span class="k">throw</span> <span class="k">new</span> <span class="n">ConcurrentModificationException</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">            <span class="k">return</span> <span class="kc">true</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">        <span class="o">}</span>
</span></span><span class="line"><span class="cl">        <span class="k">return</span> <span class="kc">false</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">    <span class="o">}</span>
</span></span><span class="line"><span class="cl">    <span class="cm">/**
</span></span></span><span class="line"><span class="cl"><span class="cm">     * 顺序遍历处理所有剩下的元素
</span></span></span><span class="line"><span class="cl"><span class="cm">     *
</span></span></span><span class="line"><span class="cl"><span class="cm">     * @param action
</span></span></span><span class="line"><span class="cl"><span class="cm">     */</span>
</span></span><span class="line"><span class="cl">    <span class="kd">public</span> <span class="kt">void</span> <span class="nf">forEachRemaining</span><span class="o">(</span><span class="n">Consumer</span><span class="o">&lt;?</span> <span class="kd">super</span> <span class="n">E</span><span class="o">&gt;</span> <span class="n">action</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">        <span class="kt">int</span> <span class="n">i</span><span class="o">,</span> <span class="n">hi</span><span class="o">,</span> <span class="n">mc</span><span class="o">;</span> <span class="c1">// hoist accesses and checks from loop
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="n">ArrayList</span><span class="o">&lt;</span><span class="n">E</span><span class="o">&gt;</span> <span class="n">lst</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">        <span class="n">Object</span><span class="o">[]</span> <span class="n">a</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">        <span class="k">if</span> <span class="o">(</span><span class="n">action</span> <span class="o">==</span> <span class="kc">null</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">            <span class="k">throw</span> <span class="k">new</span> <span class="n">NullPointerException</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">        <span class="c1">// 如果list不为空，且list中的元素不为空
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>        <span class="k">if</span> <span class="o">((</span><span class="n">lst</span> <span class="o">=</span> <span class="n">list</span><span class="o">)</span> <span class="o">!=</span> <span class="kc">null</span> <span class="o">&amp;&amp;</span> <span class="o">(</span><span class="n">a</span> <span class="o">=</span> <span class="n">lst</span><span class="o">.</span><span class="na">elementData</span><span class="o">)</span> <span class="o">!=</span> <span class="kc">null</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">            <span class="c1">// 当fence &lt; 0 时，表示fence和exceptModCount未初始化
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>            <span class="k">if</span> <span class="o">((</span><span class="n">hi</span> <span class="o">=</span> <span class="n">fence</span><span class="o">)</span> <span class="o">&lt;</span> <span class="mi">0</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">                <span class="n">mc</span> <span class="o">=</span> <span class="n">lst</span><span class="o">.</span><span class="na">modCount</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">                <span class="n">hi</span> <span class="o">=</span> <span class="n">lst</span><span class="o">.</span><span class="na">size</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">            <span class="o">}</span> <span class="k">else</span>
</span></span><span class="line"><span class="cl">                <span class="n">mc</span> <span class="o">=</span> <span class="n">expectedModCount</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">            <span class="k">if</span> <span class="o">((</span><span class="n">i</span> <span class="o">=</span> <span class="n">index</span><span class="o">)</span> <span class="o">&gt;=</span> <span class="mi">0</span> <span class="o">&amp;&amp;</span> <span class="o">(</span><span class="n">index</span> <span class="o">=</span> <span class="n">hi</span><span class="o">)</span> <span class="o">&lt;=</span> <span class="n">a</span><span class="o">.</span><span class="na">length</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">                <span class="k">for</span> <span class="o">(;</span> <span class="n">i</span> <span class="o">&lt;</span> <span class="n">hi</span><span class="o">;</span> <span class="o">++</span><span class="n">i</span><span class="o">)</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">                    <span class="nd">@SuppressWarnings</span><span class="o">(</span><span class="s">&#34;unchecked&#34;</span><span class="o">)</span> <span class="n">E</span> <span class="n">e</span> <span class="o">=</span> <span class="o">(</span><span class="n">E</span><span class="o">)</span> <span class="n">a</span><span class="o">[</span><span class="n">i</span><span class="o">];</span>
</span></span><span class="line"><span class="cl">                    <span class="n">action</span><span class="o">.</span><span class="na">accept</span><span class="o">(</span><span class="n">e</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">                <span class="o">}</span>
</span></span><span class="line"><span class="cl">                <span class="k">if</span> <span class="o">(</span><span class="n">lst</span><span class="o">.</span><span class="na">modCount</span> <span class="o">==</span> <span class="n">mc</span><span class="o">)</span>
</span></span><span class="line"><span class="cl">                    <span class="k">return</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">            <span class="o">}</span>
</span></span><span class="line"><span class="cl">        <span class="o">}</span>
</span></span><span class="line"><span class="cl">        <span class="k">throw</span> <span class="k">new</span> <span class="n">ConcurrentModificationException</span><span class="o">();</span>
</span></span><span class="line"><span class="cl">    <span class="o">}</span>
</span></span><span class="line"><span class="cl">    <span class="c1">// 估算大小
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>    <span class="kd">public</span> <span class="kt">long</span> <span class="nf">estimateSize</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">        <span class="k">return</span> <span class="o">(</span><span class="kt">long</span><span class="o">)</span> <span class="o">(</span><span class="n">getFence</span><span class="o">()</span> <span class="o">-</span> <span class="n">index</span><span class="o">);</span>
</span></span><span class="line"><span class="cl">    <span class="o">}</span>
</span></span><span class="line"><span class="cl">    <span class="c1">// 返回特征值
</span></span></span><span class="line"><span class="cl"><span class="c1"></span>    <span class="kd">public</span> <span class="kt">int</span> <span class="nf">characteristics</span><span class="o">()</span> <span class="o">{</span>
</span></span><span class="line"><span class="cl">        <span class="k">return</span> <span class="n">Spliterator</span><span class="o">.</span><span class="na">ORDERED</span> <span class="o">|</span> <span class="n">Spliterator</span><span class="o">.</span><span class="na">SIZED</span> <span class="o">|</span> <span class="n">Spliterator</span><span class="o">.</span><span class="na">SUBSIZED</span><span class="o">;</span>
</span></span><span class="line"><span class="cl">    <span class="o">}</span>
</span></span><span class="line"><span class="cl"><span class="o">}</span>
</span></span></code></pre></td></tr></table>
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